JSTL with Servlet 3.1, new methods in ServletOutputStream class

In Servlet 3.1 ServletOutputStream added 2 more abstract methods: isReady() and setWriteListener(...).

In JSTL class org/apache/taglibs/standard/tag/common/core/ImportSupport, it has an inner class extends ServletOutputStream by implementing only a write(..) method, withou implementing the 2 new methods.

Should the jstl impl be updated to servlet 3.1? Will these 2 new methods be ever called on the ServletOutputStream exposed by ImportSupport?